Conventional knee films hamper accurate knee alignment determination in patients with varus osteoarthritis of the knee

Tom M. van Raaij*, Reinoud W. Brouwer, Max Reijman, Sita M.A. Bierma-Zeinstra, Jan A.N. Verhaar

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

40 Citations (Scopus)

Abstract

Surgical therapeutic procedures such as knee osteotomy and knee replacement depend on proper knee alignment assessment. The aim of this study was to evaluate if femorotibial (FT) measurement on short knee films may be used in clinical settings. The study population comprised 68 patients with symptomatic medial compartmental knee osteoarthritis. We measured the FT angle with the use of mid-diaphyseal lines (FTa), and the knee joint centre (FTb) to determine anatomical knee alignment on a short knee image. Then, the accuracy of alignment was compared to the gold standard Hip-Knee-Ankle (HKA) angle on a full-limb view. FTa angle assessment correlated well (r = 0.65) with the HKA angle. However, this method showed poor inter-observer agreement (ICC = 0.37). 3% of patients were incorrectly classified as having valgus alignment. Good intra- and inter-observer agreements were observed for FTb angle measurement (ICC = 0.89 and 0.79; respectively). But correlation between HKA and FTb angles was low (r = 0.34). 15% of patients were incorrectly classified as having valgus alignment. Short knee images cannot substitute whole leg views when accurate assessment of knee alignment is essential.

Original languageEnglish
Pages (from-to)109-111
Number of pages3
JournalKnee
Volume16
Issue number2
DOIs
Publication statusPublished - Mar 2009

Fingerprint

Dive into the research topics of 'Conventional knee films hamper accurate knee alignment determination in patients with varus osteoarthritis of the knee'. Together they form a unique fingerprint.

Cite this